In 1910 Clyde, Blanche and the children at that time were living with his mother in South Wilbur, Lincoln Co., WA.
Their family tree is on-line at Ancestry and I've asked the author to contact you.
There is another family tree by shelby99203 which may be yours.
A Blanche B. Jones, 34, died 20 Jan 1917, Wilbur, Lincoln Co., WA. Father=Hubert Wynhoff. Mother=Caroline Kister. Source: Washington Death Index, Washington Digital Archives, digitalarchives.wa.gov/ .
You can request a copy of Blanche's obituary from Random Acts Genealogical Kindness. Go to raogk.org/, read guidelines, choose Washington, choose Lincoln Co.
contact the Washington State Library, sos.wa.gov/library/genealogy.aspx .
Tell them about the house fire and that you'd like all articles pertaining to it.
On Sept. 12, 1918 Clyde Roscoe Jones was living at #2 Wilbur, Lincoln Co., WA. Born=2 Oct 1879. Occupation=Farmer, self-employed. Nearest Relative=Thomas A. Jones, Retsil, WA. Source: World War I Draft Registration Cards 1917-18, National Archives, Ancestry.
In 1920 the children were living with the Warren family in Sherman, Lincoln Co., WA.
Dora Warren, head household, widow, 55.
Elery B. Warren, son, 24.
Arlene R. Warren, dau, 23.
Roscoe C. Jones, boarder, b. WA, 13.
Merritt F. Jones, boarder, b. WA, 12.
Bernie C. Jones, boarder, b. WA, 9.
Dorris B. Jones, boarder, b. WA, 7.
In 1920 Clyde Jones was living in Keller, Ferry Co., WA.
Clyde Jones, b. OH, 40, single, stock farmer.
His neighbor was Oscar Jones, b. OH, 48, divorced, general farmer.
A Roscoe Clyde Jones of Spokane and Gladys Marie Petefish (?) of Spokane married 29 Nov 1934. Witnesses=Ruth Petefish Miller and Merritt Jones. Source: Washington Digital Archives. You can view and print this document for free at this web site.
In 1930 Clyde was living in Sherman, Lincoln Co., WA.
Clyde R. Jones, b. OH, 50, M1 @ 25, general farmer.
Gloria W., wife, b. IA, 42, M1 @ 18.
Robert S. Jones, nephew, b. WA, 10.
A Merritt G. (?) Jones of Lincoln Co. married Irene Beardsley of Spokane Co. on 16th Aug. 1944 in Davenport, Lincoln Co., WA. Witnesses=C. R. Jones and Georgia Janes. Source: Washington State Digital Archives.
A Merritt Jones born Oct 15, 1909, Last Residence=97058 [zip code which can be looked up at usps.com] died February, 1976. Source: Social Security Death Index, Washington Digital Archives.
A Roscoe C. Jones b. Jan. 14, 1906, Last Residence=98661 [zip code lookup usps.com], died June 6, 1994 at Vancouver, Clark Co., WA. Source: Social Security Death Index, Washington Digital Archives.
You can request a copy of his obituary at RAOGK. Go to raogk.org/, choose Washington, choose Clark Co. and choose one volunteer.
I don't think the Jones children were adopted since they retained their Jones surname.
For information on how to order copies of birth and death certificates, go to doh.wa.gov/EHSPHL/CHS/cert.htm . Successful Searching!